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17 And Wellman was there for his able-bodied friend early in the climb when pieces of rock gave way, 700 feel above the group, and Corbett plunged downward. Wellman locked their rope in place, stopping the fall at 20 feel. When it was all over, both men spoke as if there hadn’t been a serious problem…

18 John Stuart Mill, the nineteenth century British philosopher, read Greek at three and had worked his way through elementary geometry and algebra and a large body of literature and history by the time he was 12.

19 Even though there has been a fascination with child prodigies for centuries, there has been little serious study of them until recently.
20 Those who have studied today's prodigies closely have observed that they often live under the great weight of their loneliness.In school with children their own age they may become bored or frustrated, and simply turn off learning completely.

21 Many children, as they enter adolescence, begin to turn to other teenagers for affection, encouragement, and a sense of belonging.

22 In this process, the atoms of a certain substance, such as a crystal or a gas, are excited in such a way that they produce coherent light. A person working with a laser can aim this coherent light, called a laser beam, in any direction.

23 He is one of the growing number of Americans who in recent years have taken up dangerous sports to fill their leisure hours.

24 They don’t like others to thing of them as thrill seekers, yet they admit the dangers of their sport. And almost all of them look down on sports like tennis and golf.

25“There’s just nothing happening in sports like tennis and golf,” said Steve Kaufman, a 44-year-old Manhattan bill collector who scuba dives in his spare time. According to him, the only people who come close to the experience of scuba divers are astronauts “because they’re in a totally alien environment, too.” Kaufman describes his sport as “a total isolation from anything that can interfere with your own personal sense of self.”

26(Para. 7) Why do people willingly seek out danger? According to Dr. George Serban, associate professor of clinical psychiatry at New York University, most men do it to prove their masculinity.

27“The nature of the male animal is to undertake dangerous tasks and to confront them and to succeed,” Dr. Serban said. When life becomes boring and routine,” Serban says, and men do not have a chance for adventure or a chance to prove their masculinity, the only other possibility for them is to undertake dangerous activities.

28 Eric D. Rosenfeld, a 43-year-old Manhattan layer who has been climbing mountains for 20years, spoke of the habit-forming nature of his sport. “It’s quite addictive,” he says. “You get addicted to the risk factor.”

29 People in the United States spend over $2 billion a year on nonprescription pain relievers. Although effective, these pain relievers are not without problems.

30 There are over 100 brands, and most come in various forms (for example, tablets or capsule) and various strengths (such as regular and extra strength).

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